You should correct the CM % to show real values. Out of 7 items if 1 makes it to +12 you are lucky. Out of 16 items+13 (non-exc) 2 made it to +15 Out of 10-15 Flaming Phoenix Bows none made it to +13 (1 to +12) .. and many more examples Obviously all above items were +luck Burning 4-7 items in a row on 75% or higher chance is nothing unusual. On the other hand I never succeeded in upgrading more than 3. It is just not possible to call it bad luck, so that 75-85% is a joke. So yeah, game over for me.